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In transmission lines, preformed tie wire is becoming the choice of more and more power grid companies. According to industry data, the domestic purchase volume of preformed tie wire in 2023 increased by 35% year-on-year, and some wind power projects even listed preformed tie wire as the standard for cable protection.

Although the production cost of Preformed fittings is slightly higher than that of traditional power fittings, in the long run, the use of Preformed fittings can greatly reduce the operating cost of the line. Do you know what Preformed fittings are? What are their functions?

Protective fittings are a type of fittings used for line protection in power fittings. They are key components used for protection in power lines, such as preformed vibration damper,Preformed tie wire and cable fitting pole clamp, which ensure the electrical and mechanical safety of lines in different scenarios. Do you know their specific applications?

Preformed Helical Suspension Clamp is a common hardware for hanging optical cables on transmission line towers, and it plays an important role all the time. Preformed Helical Suspension Clamp is mainly used for connecting optical cables with straight towers or towers with an angle of less than 25°, one set for each tower. The wire clamp can reduce the static stress of the optical cable at the suspension point, improve the vibration resistance of the optical cable, and overcome the dynamic stress of wind vibration; it can also ensure that the bending of the optical cable does not exceed the allowed value, so as not to generate bending stress, thus ensuring that the optical fiber will not be lost.

There are many factors that affect the Grounding Wire Clamp in electrical safety, such as the conductivity and corrosion resistance of the Grounding Wire Clamp material, the cross-sectional area, etc. Generally speaking, commonly used grounding materials include copper, aluminum, and steel. Copper has good conductivity and corrosion resistance, but the cost is high. The conductivity of aluminum is slightly inferior to copper, but its price is relatively low. In practical applications, it is necessary to select suitable grounding materials according to specific environments and requirements. In addition to considering the conductivity and corrosion resistance of the material, it is also necessary to pay attention to its cross-sectional area. A cross-sectional area that is too small will increase resistance and affect the grounding effect. According to relevant standards and specifications, the cross-sectional area of Grounding Wire Clamps of different uses and current sizes has clear requirements. Among these influencing factors, people often ignore that the length of the Grounding Wire Clamp will also affect electrical safety. Let's talk about it next.

In the tension section across the Yangtze River in China's "West-to-East Power Transmission" project, Preformed conductor strain clamps are used to replace traditional bolt-type wire clamps to avoid conductor damage caused by stress concentration. The Preformed wire is fully in contact with the conductor. Through field testing, it has been running in strong wind areas for 3 years without slippage or broken strands, and the maintenance cost is reduced. Preformed conductor strain clamps play an important role in preformed hardware.